Why is the mafia so often associated with the garbage industry?

Why is the mafia so often associated with the garbage industry?:

The mob ran the garbage business in many big cities. As Kenneth J. Prendergast notes in this in-depth article, Cleveland, Ohio, was among the most notorious. Thanks to new technologies, the business of garbage hauling boomed in the 1950s and 60s, when the mob was 'at its peak.' Organized crime targeted the trash business because it was a great way to launder profits from illegal businesses, and it gave Mafioso (like Tony Soprano) legit jobs for tax purposes.

New York City's garbage business was also once largely under mob control. 'The Hidden Life of Garbage' explains how that changed in the mid-90s, when businesses like Waste Management and Browning Ferris entered the fray. Their lower prices and a government investigation led by undercover cop Rick Cowan pushed out the mob."